<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>海景</title>
    <style>
        .biankuang{
            width: 688px;
            height: 500px;
            border: 100px solid black;
        }
        .blue{
            width: 688px;
            height: 500px;
            background-color:powderblue;
            overflow: hidden;
            position: relative;
        }

        .a{
            background-color:rgb(196, 162, 117);
            width: 300px;
            height: 200px;
            border-radius: 100%;
            left: -50px;
            bottom: -95px;
            position: absolute;
        }

        .b{
            background-color:rgb(196, 162, 117);
            width: 300px;
            height: 200px;
            border-radius: 100%;
            left: 180px;
            bottom: -95px;
            position: absolute;
        }
        

        .c{
            background-color:rgb(196, 162, 117);
            width: 300px;
            height: 200px;
            border-radius: 100%;
            left: 420px;
            bottom: -95px;
            position: absolute;
        }

        .taiyan{
            width: 100px;
            height: 100px;
            border-radius: 50%;
            position: absolute;
            top: 40px;
            right:50px;
            background-image: linear-gradient(red,yellow);
        }


        
        
    </style>
</head>
<body>
    <div class="biankuang">
        <div class="blue">
            <div class="a"></div>
            <div class="b"></div>
            <div class="c"></div>
            <div class="taiyan"></div>
        </div>
    </div>
</body>
</html>